JP4575885B2 - Cordless telephone equipment - Google Patents

Description

  The present invention relates to a cordless telephone device that charges a battery of a handset.

  A cordless telephone device includes, for example, a rechargeable battery mounted on a cordless phone called a child device, and the child device is set on a charging stand or a dedicated charging stand provided on the phone body called a parent device. Charging. The parent machine may include functions such as a facsimile. In order to prevent the child device from falling over when the child device is set on the charging stand, measures are taken such as widening the bottom surface of the child device or increasing the depth of the recess for housing the child device.

  As a first conventional technique for charging a battery of a portable unit, there is a cordless telephone that performs contactless charging. This cordless telephone is provided with a second coil that is magnetically coupled to a first coil provided in a charging device, and a rectifier circuit that rectifies an alternating current output from the second coil in a slave unit. The rectified output is supplied as a charging voltage to the rechargeable battery of the slave unit. By making the width of the bottom surface of the portable portion wide, the fall when the portable portion is placed is prevented (for example, see Patent Document 1).

  As a second conventional technique, there is a cordless telephone device that performs contactless charging. This cordless telephone device is generated by electromagnetic induction of the primary winding and the secondary winding provided in the slave unit which is a mobile station so as to face the primary winding provided in the base station. The battery of the handset is charged using alternating current (see, for example, Patent Document 2). Patent Document 2 does not describe the shapes of the slave unit and the base station that are mobile stations.

  As a third conventional technique, there is a cordless telephone device that performs contactless charging when the approach of a portable unit is detected. In this cordless telephone device, a power supply coil connected to an approach detecting means and an oscillating means for detecting the approach of the mobile unit is provided in the main body, and the power supply coil is connected to the mobile unit when the mobile unit is stored in the main body. A receiving coil and a rectifying means arranged so as to be electromagnetically coupled to each other. When the approach detection means detects the approach of the portable unit, the oscillation means is driven (see, for example, Patent Document 3). Patent Document 3 does not describe the shape of the handset that is the portable unit and the main body.

  As a fourth conventional technique, there is a contactless charging power supply connection device that can eliminate conductive foreign matter. In this charging power supply connecting device, a primary coil portion covered with an insulating cover is provided on a charging stand, and a secondary coil portion covered with an insulating cover is provided on an object to be charged such as a cordless telephone. When the object to be charged is placed on the charging stand, both coil portions are close to each other, and electric power is supplied from the charging stand to the charging battery of the object to be charged by electromagnetic induction. Furthermore, a foreign matter removing portion is provided on the outer surface of the portion of the insulating cover corresponding to the primary coil portion of the charging stand to remove the conductive foreign matter by sliding it sideways with its own weight. By making the bottom surface of the object to be charged wider, the fall when the part to be charged is placed is prevented (see, for example, Patent Document 4).

JP-A-6-90201 Japanese Patent Laid-Open No. 3-208441 JP-A-3-235626 Japanese Utility Model Publication No. 6-24356

  However, the cordless telephone device has a strong demand for reduction in size and weight, and in order to reduce the size of the charging stand, it is necessary to reduce the width of the bottom surface of the slave unit and reduce the thickness of the charging stand. The above-described conventional techniques are for charging a battery by a contactless charging method, but the first and fourth conventional techniques are used when the slave unit is placed with the bottom surface of the slave unit widened. There is a problem that the fall of the handset cannot be narrowed because it prevents falling. Regarding the second and third conventional techniques, Patent Document 2 and Patent Document 3 do not describe the shapes of the slave unit and the charging stand.

  An object of the present invention is to provide a cordless telephone that can prevent the handset from falling even if the bottom face of the handset is narrowed and the concave portion of the charging unit is shallow.

The present invention provides a handset in which a first recess is provided at the center of the end face of one end in the longitudinal direction;
A flat bottom surface facing upward is provided, and when the slave unit is placed, a second recess is provided in which a projection that fits into the first recess of the slave unit is formed at the center of the bottom surface. Including live parts,
The shape of the projecting portion is supported by tilting in a state in which a part of the peripheral edge of the end surface provided with the first concave portion is in contact with the bottom surface of the second concave portion of the charging unit. And when some of the corners of the outer peripheral surface of the handset extending in the longitudinal direction come into contact with the inner peripheral surface of the second concave portion of the charging unit, the inner peripheral surface of the first concave portion and the one end portion A part of the periphery where the end face intersects the outer peripheral surface of the protrusion ,
The shape cut by a surface perpendicular to the direction of gravity of the inner peripheral surface of the second recess of the charging unit is a circle,
Of the four sides of the rectangle that are in contact with the four sides of the outer periphery of the cutting plane perpendicular to the longitudinal direction of the slave unit, the length of one set of two parallel sides is shorter than the length of the other set of two parallel sides,
In the cordless telephone device, the height of the inner peripheral surface of the second recess is higher than the height of the outer peripheral surface of the protrusion .

According to the present invention, the slave unit is provided with the first concave portion at the center of the end face at one end in the longitudinal direction, the charging unit has a flat bottom surface facing upward, and the slave unit is placed. A second recess formed in the central portion of the bottom surface of the projection that fits into the first recess of the slave is provided, and the shape of the projection is Among the corners of the outer peripheral surface of the slave unit that is supported while being tilted and supported in a state in which a part of the peripheral edge of the end surface provided with the concave portion is in contact with the bottom surface of the second concave portion of the charging unit. When a part contacts the inner peripheral surface of the second recess of the charging unit, a part of the periphery where the inner peripheral surface of the first recess intersects the end surface of the one end is the outer peripheral surface of the protrusion. To touch. And the shape cut | disconnected by the surface perpendicular | vertical to the gravity direction of the internal peripheral surface of the 2nd recessed part of the said charging part is circular, and the rectangle which the four sides of the outer periphery of the cut surface perpendicular | vertical to the longitudinal direction of the said subunit | mobile_unit each contact | connect Of the four sides, the length of one set of two parallel sides is shorter than the length of the other set of two parallel sides, and the height of the inner peripheral surface of the second recess is greater than the height of the outer peripheral surface of the protrusion. Is also expensive.

As described above, the first concave portion is provided in the central portion of the end face of the longitudinal end portion of the slave unit, and the second concave portion has a flat bottom surface facing upward, and the slave unit is placed thereon. When the charging device is provided with a second recess formed in the center portion of the bottom surface of the protrusion that fits into the first recess of the slave device, the shape of the protrusion is A corner portion of the outer peripheral surface of the slave unit that is supported while being inclined with a part of the peripheral edge of the end surface provided with the first concave portion in contact with the bottom surface of the second concave portion of the charging unit and extending in the longitudinal direction When a part of the inner surface of the charging part contacts the inner peripheral surface of the second recess, the part of the peripheral edge where the inner peripheral surface of the first recess and the one end surface of the end part intersect Since it contacts the outer peripheral surface, even if the bottom surface of the slave unit is narrowed and the concave portion of the charging unit is shallow, the bottom surface of the slave unit can be prevented from shifting and the slave unit can be prevented from falling. Kill.
Moreover, since the shape cut | disconnected by the surface perpendicular | vertical to the gravity direction of the internal peripheral surface of the 2nd recessed part of a charging part is circular, it can mount in any direction.
In addition, among the four sides of the rectangle that are in contact with the four sides of the outer periphery of the cutting plane perpendicular to the longitudinal direction of the slave unit, the length of one set of two parallel sides is shorter than the length of the other set of two parallel sides. Therefore, the thickness of the slave unit can be reduced including the bottom portion of the slave unit.

Moreover, this invention contains the 1st coil by which the said subunit | mobile_unit is a 1st coil for charging a battery, Comprising: The 1st coil arrange | positioned inside the end surface provided with the said 1st recessed part,
The charging unit is a second coil for supplying electric power to the first coil by electromagnetic induction, and faces the first coil when the slave unit is placed in the second recess. A second coil disposed inside the second recess bottom surface is included.

  According to the present invention, the slave unit includes a first coil disposed in the vicinity of the end surface provided with the first recess for charging the battery, and the charging unit is A second coil for supplying power to the coil, and disposed inside the second recess bottom so as to face the first coil when the slave unit is placed in the second recess. Therefore, when the slave unit is placed on the charging unit, an electromotive force is generated in the first coil of the slave unit by electromagnetic induction from the second coil of the charging unit.

  Moreover, this invention has the flat surface which the end surface provided with the 1st recessed part of the said subunit | mobile_unit contacts the bottom face of a 2nd recessed part when a subunit | mobile_unit is mounted in the 2nd recessed part of the said charging part. It is characterized by that.

  According to the present invention, the end surface of the slave unit provided with the first recess has a flat surface that comes into contact with the bottom surface of the second recess when the slave unit is placed in the second recess of the charging unit. So you can put the handset upright.

According to the present invention, even if the bottom surface of the slave unit is narrowed and the concave portion of the charging unit is shallow, the bottom surface of the slave unit can be prevented from being displaced and the slave unit can be prevented from falling down. The apparatus can be miniaturized. Furthermore, it is possible to prevent damage to the slave unit due to falling or insufficient charging due to disconnection from the charging unit.
Further, since the slave unit can be placed in any direction, the slave unit can be placed without being limited to the orientation of the master unit.
In addition, since the thickness of the child device including the bottom portion of the child device can be reduced, the shape of the child device can be easily held and reduced in size.

  According to the present invention, when the slave unit is placed on the charging unit, an electromotive force is generated in the first coil of the slave unit due to electromagnetic induction from the second coil of the charging unit. Can be charged. Further, since the protrusion is provided in the second recess, when a conductive foreign matter such as a coin enters the second recess, the size of the foreign matter is determined by the outer periphery of the protrusion and the side surface of the second recess. If the distance is larger than the distance, the foreign matter does not contact the bottom surface of the second recess, and the foreign matter and the second coil can be separated from each other. This can be suppressed as compared with the case of contacting the bottom surface of the second recess.

  Further, according to the present invention, since the slave unit can be placed upright, the slave unit can be placed in an easy-to-take form.

  FIG. 1 is a cross-sectional view of a cordless telephone device 1 according to an embodiment of the present invention. The cordless telephone device 1 is a telephone device including a parent device 10 and a child device 20, and the parent device 10 may include functions such as a facsimile function. FIG. 1 shows a cut surface obtained by cutting the cordless telephone device 1 along a plane parallel to the direction of gravity.

  The base unit 10 is directly connected to a telephone line, performs wireless communication with the handset 20, and enables a call on the handset 20. Master device 10 includes a charging stand portion for charging child device 20, that is, a charging unit. The main unit 10 is supplied with power from a commercial power source and is also supplied to the charging stand. The charging stand portion is provided with a slave unit storage portion 13 that is a recess for storing the slave unit 20, and a fall prevention projection 11 is provided at the center of the bottom surface of the recess of the slave unit storage portion 13. A parent charging coil 12 is provided inside the parent device 10 in the vicinity of the fall prevention protrusion 11. The main unit charging coil 12 supplies electric power to the sub unit 20 by electromagnetic induction and charges the battery of the sub unit 20.

  The subunit | mobile_unit 20 is a portable telephone containing a battery, and is the shape which rounded the corner | angular of the hexahedron which consists of six squares. Hereinafter, the major axis direction of the surface having the longest surface among the quadrangles constituting the hexahedron is referred to as the longitudinal direction of the slave unit 20. One end surface of one end portion in the longitudinal direction has a flat end surface, and a tipping prevention protrusion storage portion 21 which is a recess for storing the tipping prevention protrusion portion 11 of the base unit 10 is provided at the center portion of the end surface. The handset 20 is placed so that the surface on which the fall prevention protrusion housing portion 21 is located is in contact with the bottom surface of the handset housing portion 13 of the base device 10. The subunit | mobile_unit 20 can be accommodated in the subunit | mobile_unit accommodating part 13 in the state in which the longitudinal direction of 20 becomes parallel to a gravitational direction. When the handset 20 is stored in the handset storage unit 13, the fall prevention protrusion 11 is fitted and stored in the fall prevention protrusion storage 21.

  When the magnetic field in the coil is changed, a force for causing a current to flow in the coil, that is, an induced electromotive force is generated. The induced electromotive force follows Faraday's law, which is proportional to the amount of change per unit time of the magnetic field passing through the coil. That is, the slave unit 20 is provided with a slave unit charging coil 22 in the vicinity of the fall-preventing projection storage unit 21, and when the slave unit 20 is stored in the slave unit storage unit 13 of the master unit 10, Charging coil 22 is closest to base unit charging coil 12. The slave unit charging coil 22 receives power by electromagnetic induction from the master unit charging coil 12 to charge the battery.

  As the distance from the coil that generates the magnetic field, for example, the main unit charging coil 12 to the sub unit charging coil 22 increases, the magnetic flux density across the sub unit charging coil 22 that generates the induced electromotive force decreases. The amount of change is also reduced. When the distance from the main unit charging coil 12 to the sub unit charging coil 22 exceeds a certain level, there is no change in the magnetic field across the sub unit charging coil 22, and the battery is not charged. The circuits of the parent device 10 and the child device 20 for charging by such a contactless charging method are based on the prior art, and the description thereof is omitted.

  FIG. 2 shows an example of the configuration of base unit 10 shown in FIG. FIG. 2A is a plan view of the base unit 10 and is a view seen from above the base unit 10 when the base unit 10 is placed on a horizontal plane. There is a circular fall prevention projection 11 at the center of the circular slave unit storage unit 13. The main unit charging coil 12 is arranged concentrically with the overturning preventing projection 11. In this example, the shape of the main unit charging coil 12 viewed from above is circular, but it is not necessarily circular.

  FIG. 2B is a cross-sectional view of the base unit 10 at a cut surface in the gravitational direction including the center of the handset storage unit 13 shown in FIG. The base unit charging coil 12 is disposed inside the base unit 10 in the vicinity of the fall prevention protrusion 11. The bottom surface of the child device storage portion 13 is a flat surface except for the fall prevention projection portion 11. The internal diameter of the subunit | mobile_unit accommodating part 13 is 44.9 mm, for example. The fall prevention protrusion 11 has a diameter of, for example, 10 mm, and the fall prevention protrusion 11 has a height of, for example, 2.15 mm.

  FIG.2 (c) shows the main | base station charging coil 12, and the center part has penetrated the main | base station charging coil 12. FIG. The diameter of base unit charging coil 12 is, for example, 21 mm, and the diameter of the penetrating portion is, for example, 7.5 mm.

  FIG. 3 shows an example of the configuration of the slave unit 20 shown in FIG. FIG. 3A shows a cross section on the side where the fall prevention protrusion accommodating portion 21 is present, among the cross sections when the handset 20 is cut in the longitudinal direction. The handset charging coil 22 is concentric with the center of the overturn prevention protrusion housing portion 21 and is located in the longitudinal direction of the handset 20 with respect to the overturn prevention protrusion housing portion 21 and close to the overturn prevention protrusion housing portion 21. Thus, it is arranged so as to cover the fall prevention protrusion housing part 21. The width of the child device 20 is, for example, 44.6 mm. The lateral width of the slave unit 20 is the length of the longer side among the sides that form a rectangle in contact with the outer periphery of the cut surface perpendicular to the longitudinal direction of the slave unit 20. The inner diameter of the overturn prevention protrusion accommodating part 21 is, for example, 10.1 mm, and the depth of the overturn prevention protrusion accommodating part 21 is, for example, 2.2 mm.

  FIG. 3B shows a surface (hereinafter referred to as a bottom surface) on which the fall prevention protrusion accommodating portion 21 is provided. On the bottom surface, there is a concave portion of the fall prevention protrusion housing part 21, the handset charging coil 22 is arranged concentrically with the fall prevention protrusion housing part 21, and a part of the handset charging coil 22 is provided with the fall prevention protrusion housing part 21. It is in a positional relationship that overlaps. The thickness of the subunit | mobile_unit 20 is 28 mm, for example. The thickness of the slave unit 20 is the length of the shorter side among the sides constituting the rectangle that contacts the outer periphery of the cut surface perpendicular to the longitudinal direction of the slave unit 20. FIG.3 (c) shows the subunit | mobile_unit charging coil 22, and the center part has penetrated the subunit | mobile_unit charging coil 22. FIG. The diameter of handset charging coil 22 is, for example, 21 mm, and the diameter of the penetrating portion is, for example, 7.5 mm.

  FIG. 4 shows another example of the configuration of the slave unit 20 shown in FIG. FIG. 4A shows a cross section on the side where the fall prevention protrusion accommodating portion 21 is present, among the cross sections when the handset 20 is cut in the longitudinal direction. The handset charging coil 23 is concentric with the center of the fall-preventing protrusion accommodating portion 21, and is located in the handset 20 within the depth range of the fall-preventing protrusion accommodating portion 21 and close to the tip-preventing protrusion accommodating portion 21. And it arrange | positions so that the fall prevention protrusion accommodating part 21 may be enclosed. The width of the child device 20 is, for example, 44.6 mm. The inner diameter of the overturn prevention protrusion accommodating part 21 is, for example, 10.1 mm, and the depth of the overturn prevention protrusion accommodating part 21 is, for example, 2.2 mm.

  FIG. 4B shows the bottom surface of the handset 20. On the bottom surface, there is a concave portion of the fall prevention protrusion storage portion 21, and the slave charging coil 23 is arranged concentrically with the fall prevention protrusion storage portion 21. In this case, the handset charging coil 23 is not in a positional relationship overlapping with the fall prevention protrusion accommodating portion 21. The thickness of the subunit | mobile_unit 20 is 28 mm, for example. FIG.4 (c) shows the subunit | mobile_unit charging coil 23, and the center part has penetrated the subunit | mobile_unit charging coil 23. FIG. The diameter of handset charging coil 22 is, for example, 21 mm, and the diameter of the penetrating portion is, for example, 15 mm.

  The main unit charging coil 12 shown in FIG. 2 has a through-hole diameter of 7.5 mm. Similar to the sub unit charging coil 23 shown in FIG. A charging coil having a positional relationship in which the machine charging coil 12 and the toppling prevention protrusion 11 do not overlap each other, for example, a charging coil having a through-hole diameter of 15 mm may be used.

  FIG. 5 is a diagram for explaining a fall prevention mechanism of the cordless telephone device 1 shown in FIG. FIG. 5A shows a cut surface obtained by cutting the cordless telephone device 1 on which the handset 20 is placed by a plane parallel to the direction of gravity including the center of the fall prevention protrusion 11, and FIG. The cut surface XX shown to Fig.5 (a) is shown. In any case, the slave unit 20a indicates a state in which the slave unit 20 is tilted.

  The handset 20 is supported by being inclined and supported in a state where a part C of the peripheral edge of the bottom face of the handset 20 is in contact with the bottom face of the concave portion of the handset storage unit 13, and a part of the outer peripheral surface in the longitudinal direction of the handset 20. Is in contact with the inner peripheral surface of the concave portion of the child device storage portion 13 at the A portion and / or A ′ portion to enter the state of the child device 20a, the inner peripheral surface of the overturning protrusion storage portion 21 of the child device 20 Since a part of the periphery where the bottom surface of the slave unit 20 intersects with the outer peripheral surface of the fall prevention projection 11 of the master unit 10 at the B part, a deviation of a part C of the peripheral edge of the bottom surface of the slave unit 20 occurs. It stops, and the fall of the subunit | mobile_unit 20 can be prevented. At this time, the displacement of the child device 20 at the cut surface XX is 1.2 mm, and the inclination of the child device 20 is 5.8 degrees.

  In the above-described embodiment, the parent device 10 and the child device 20 have been described. However, the cordless telephone device 1 may include a charging stand dedicated to charging. The charging stand dedicated to charging is provided with a slave unit storage portion and a master unit charging coil having the same shape as the master unit 10 shown in FIG. 2, and can charge the slave unit 20. When a charging stand dedicated to charging is included, the charging stand portion may be removed from the base unit 10.

  As described above, the first concave portion is provided in the central portion of the end face of the longitudinal end portion of the slave unit, and the second concave portion has a flat bottom surface facing upward, and the slave unit is placed thereon. When the charging device is provided with a second recess formed in the center portion of the bottom surface of the protrusion that fits into the first recess of the child device, the shape of the protrusion is A part of the outer peripheral surface of the handset extending in the longitudinal direction is supported while being inclined with a part of the peripheral edge of the end surface provided with the first concave part in contact with the bottom surface of the second concave part of the charging stand. When contacting the inner peripheral surface of the second recess of the charging base, a part of the peripheral edge where the inner peripheral surface of the first recess and the end surface of the one end intersect the outer peripheral surface of the protrusion, Even if the bottom surface of the slave unit is narrowed and the concave portion of the charging stand is shallow, the bottom surface of the slave unit can be prevented from shifting, and the slave unit can be prevented from falling. Therefore, the cordless telephone device can be reduced in size. Furthermore, it is possible to prevent the child device from being damaged due to a fall or insufficient charging due to being detached from the charging stand.

  Furthermore, the subunit | mobile_unit 20 contains the 1st coil, for example, the subunit | mobile_unit charging coil 22 arrange | positioned inside the vicinity of the end surface provided with the 1st recessed part, ie, the fall prevention protrusion accommodating part 21, in order to charge a battery, The charging stand, for example, the charging stand portion of the base unit 10 is a second coil for supplying power to the first coil by electromagnetic induction, and the handset 20 is mounted in the second recess, that is, the handset storage unit 13. Since it includes a second coil, for example, a main unit charging coil 12 that is disposed in the vicinity of the bottom surface of the second recess so as to face the first coil when placed, the slave unit 20 is placed on the charging stand. Then, an electromotive force is generated in the first coil of the slave unit, for example, the slave unit charging coil 22 due to electromagnetic induction from the second coil of the charging stand, for example, the master unit charging coil 12. Therefore, the battery of the slave unit can be charged.

  In addition, since the fall prevention projection 11 is provided in the slave unit storage portion 13, when a conductive foreign matter such as a coin enters the slave unit storage portion 13, the size of the foreign matter is the size of the fall prevention projection 11. If the distance is larger than the distance between the outer periphery and the side surface of the child device storage portion 13, the foreign material does not come into contact with the bottom surface of the recess of the child device storage portion 13, and the foreign material and the main device charging coil 12 can be separated. When the distance from the main unit charging coil 12 to the sub unit charging coil 22 is increased, the magnetic flux density across the sub unit charging coil 22 in which the induced electromotive force is generated decreases, so that the amount of change in the magnetic field of the sub unit charging coil 22 also decreases. Similarly to the slave unit charging coil 22, the magnetic field of the conductive foreign matter that has entered the slave unit storage unit 13 changes. The fall prevention protrusion 11 can increase the distance between the conductive foreign matter and the main unit charging coil 12, so that the amount of change in the magnetic field with respect to the foreign matter can also be reduced. Therefore, the heat generation of the conductive foreign matter caused by the change of the magnetic field can be suppressed as compared with the case where the foreign matter is in contact with the second recess, that is, the bottom surface of the slave unit storage portion 13.

  Furthermore, since the shape of the second recessed portion of the charging stand, that is, the inner peripheral surface of the child device storage portion 13 cut by a surface perpendicular to the direction of gravity is circular, the child device 20 can be moved in any direction, that is, the child device storage portion 13. It can be placed in any direction of 360 degrees centered on the direction of gravity passing through the center. Therefore, the slave unit 20 can be placed without being limited to the orientation of the master unit 10.

  Furthermore, the end surface provided with the fall prevention protrusion storage portion 21 that is the first recess of the slave unit 20 is placed on the slave unit storage portion 13 that is the second recess of the charging base. Since it includes a plane in contact with the plane of the bottom surface of the second recess, the handset 20 can be placed upright. Therefore, the subunit | mobile_unit 20 can be placed with the form which is easy to take.

  Furthermore, the length of one set of two parallel sides out of the four sides of the rectangle whose outer periphery of the cutting plane perpendicular to the longitudinal direction of the handset 20 is in contact with each of the four sides is the length of the other set of two parallel sides. Therefore, the thickness of the slave unit 20 including the bottom portion of the slave unit 20 can be reduced. Therefore, the shape of the handset 20 can be easily held and reduced in size.

It is sectional drawing of the cordless telephone apparatus 1 which is one Embodiment of this invention. An example of the configuration of base unit 10 shown in FIG. 1 is shown. An example of the structure of the subunit | mobile_unit 20 shown in FIG. 1 is shown. The other example of a structure of the subunit | mobile_unit 20 shown in FIG. 1 is shown. It is a figure for demonstrating the fall prevention mechanism of the cordless telephone apparatus 1 shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cordless telephone apparatus 10 Main | base station 11 Fall prevention protrusion 12 Slave unit charging coil 13 Slave unit storage unit 20 Sub unit 21 Fall prevention projection storage unit 22, 23 Base unit charging coil

Claims (3)

A handset provided with a first recess in the center of the end face of one end in the longitudinal direction;
A flat bottom surface facing upward is provided, and when the slave unit is placed, a second recess is provided in which a projection that fits into the first recess of the slave unit is formed at the center of the bottom surface. Including live parts,
The shape of the projecting portion is supported by tilting in a state in which a part of the peripheral edge of the end surface provided with the first concave portion is in contact with the bottom surface of the second concave portion of the charging unit. And when some of the corners of the outer peripheral surface of the handset extending in the longitudinal direction come into contact with the inner peripheral surface of the second concave portion of the charging unit, the inner peripheral surface of the first concave portion and the one end portion A part of the periphery where the end face intersects the outer peripheral surface of the protrusion ,
The shape cut by a surface perpendicular to the direction of gravity of the inner peripheral surface of the second recess of the charging unit is a circle,
Of the four sides of the rectangle that are in contact with the four sides of the outer periphery of the cutting plane perpendicular to the longitudinal direction of the slave unit, the length of one set of two parallel sides is shorter than the length of the other set of two parallel sides,
A cordless telephone device, wherein the height of the inner peripheral surface of the second recess is higher than the height of the outer peripheral surface of the protrusion . The slave unit includes a first coil for charging a battery, the first coil being disposed in the vicinity of an end surface provided with the first recess,
The charging unit is a second coil for supplying electric power to the first coil by electromagnetic induction, and faces the first coil when the slave unit is placed in the second recess. The cordless telephone device according to claim 1, further comprising a second coil disposed inside the second concave bottom surface.   The end surface of the slave unit provided with the first recess has a flat surface that is in contact with the bottom surface of the second recess when the slave unit is placed in the second recess of the charging unit. The cordless telephone apparatus according to claim 2.

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